GROUPING_PAIR_MU-EL34 137STANDARD_TUBE_SET TS-7027 NOS-6BQ5 468STANDARD_TUBE_SET NOS-6SN7GT-SYL-1940S 242STANDARD_TUBE_SET SO-6AS7G 235STANDARD_TUBE_SET GROUPING_PAIR_EH-6922 NOS-5993 NOS-6922-AMP-USA 243STANDARD_TUBE_SET NOS-6L6GC-BP-U 379STANDARD_TUBE_SET 603STANDARD_TUBE_SET NOS-5814A-SYL-2MICA NOS-6AT6 JJ-2A3-40 JJ-300B